| 摘要 |
<p>PURPOSE:To record the picture of an objective person to be watched without making him aware of the installation of a monitor camera by recording the picture of the objective person to be watched by the output of a sensor when it is detected by the sensor that the objective person to be watched approaches to the neighborhood of the monitor camera. CONSTITUTION:The sensor 10 is provided as the slave machine of a doorphone together with a calling button 11 and the monitor camera 12, and it can be detected that a visitor approaches to the neighborhood of the monitor camera 12 by using, for instance, an infrared ray. Accordingly, even though the push button 11 is not pushed, if there is the visitor to the neighborhood of the monitor camera 12, the picture of the visitor can be recorded by the output of the sensor 10. Thus, the picture of the visitor can be recorded without making him aware of the installation of the monitor camera 12, and crime prevention effect can be raised.</p> |
